(五)Spring注解方式整合Mybatis---Spring简明快速入门学习

Spring整合Mybatis分析（注解方式）

配置文件更改解析

注解整合MyBatis分析

1、业务类使用注解形式声明bean，属性采用注解注入

2、建立独立的配置管理类，分类管理外部资源，根据功能进行分类，并提供对应的方法获取bean

3、使用注解形式启动bean扫描，加载所有注解配置的资源(bean)

4、使用AnnotationConfigApplicationContext对象加载所有的启动配置类，内部使用导入方式进行关联

注解整合MyBatis步骤

1．修改mybatis外部配置文件格式为注解格式

2．业务类使用@Component声明bean，使用@Autowired注入对象

3．建立配置文件JDBCConfig与MyBatisConfig类，并将其导入到核心配置类SpringConfig

4．开启注解扫描

5．使用AnnotationConfigApplicationContext对象加载配置项

Spring整合Junit

如何在Junit中使用spring中的资源?

1. Spring接管Junit的运行权，使用Spring专用的Junit类加载器

2.为Junit测试用例设定对应的spring容器

注意：

从Spring5.0以后，要求Junit的版本必须是4.12及以上。

Junit仅用于单元测试，不能将Junit的测试类配置成spring的bean，否则该配置将会被打包进入工程中。

Spring Junit坐标：

<dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-test</artifactId>
    <version>5.1.9.RELEASE</version>
</dependency>

Spring Junit测试类：

package com.itheima.service;

import com.itheima.config.SpringConfig;
import com.itheima.domain.Account;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import java.util.List;

//设定spring专用的类加载器
@RunWith(SpringJUnit4ClassRunner.class)
//设定加载的spring上下文对应的配置
@ContextConfiguration(classes = SpringConfig.class)
public class UserServiceTest {

    @Autowired
    private AccountService accountService;

    @Test
    public void testFindById(){
        Account ac = accountService.findById(2);
//        System.out.println(ac);
        Assert.assertEquals("Jock1",ac.getName());
    }

    @Test
    public void testFindAll(){
        List<Account> list = accountService.findAll();
        Assert.assertEquals(3,list.size());
    }

}

Spring整合Mybatis代码（注解方式）

项目结构

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.itheima</groupId>
    <artifactId>Spring_day02_02</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>11</maven.compiler.source>
        <maven.compiler.target>11</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.3</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.26</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.16</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.0</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
    </dependencies>
</project>

jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/spring_db
jdbc.username=root
jdbc.password=123456

config包

JDBCConfig.java

package com.itheima.config;

import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;

import javax.sql.DataSource;

public class JDBCConfig {
    @Value("${jdbc.driver}")
    private String driver;
    @Value("${jdbc.url}")
    private String url;
    @Value("${jdbc.username}")
    private String userName;
    @Value("${jdbc.password}")
    private String password;

    @Bean("dataSource")
    public DataSource getDataSource(){
        DruidDataSource ds = new DruidDataSource();
        ds.setDriverClassName(driver);
        ds.setUrl(url);
        ds.setUsername(userName);
        ds.setPassword(password);
        return ds;
    }
}

MyBatisConfig.java

package com.itheima.config;

import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;

import javax.sql.DataSource;

public class MyBatisConfig {

    @Bean
    public SqlSessionFactoryBean getSqlSessionFactoryBean(@Autowired DataSource dataSource){
        SqlSessionFactoryBean ssfb = new SqlSessionFactoryBean();
        ssfb.setTypeAliasesPackage("com.itheima.domain");
        ssfb.setDataSource(dataSource);
        return ssfb;
    }

    @Bean
    public MapperScannerConfigurer getMapperScannerConfigurer(){
        MapperScannerConfigurer msc = new MapperScannerConfigurer();
        msc.setBasePackage("com.itheima.dao");
        return msc;
    }

}

SpringConfig.java

package com.itheima.config;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.context.annotation.PropertySource;

@Configuration
@ComponentScan("com.itheima")
@PropertySource("classpath:jdbc.properties")
@Import({JDBCConfig.class,MyBatisConfig.class})
public class SpringConfig {
}

dao

AccountDao.java

package com.itheima.dao;

import com.itheima.domain.Account;
import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;
import org.mybatis.spring.SqlSessionFactoryBean;

import java.util.List;

public interface AccountDao {

    @Insert("insert into account(name,money)values(#{name},#{money})")
    void save(Account account);

    @Delete("delete from account where id = #{id} ")
    void delete(Integer id);

    @Update("update account set name = #{name} , money = #{money} where id = #{id} ")
    void update(Account account);

    @Select("select * from account")
    List<Account> findAll();

    @Select("select * from account where id = #{id} ")
    Account findById(Integer id);
}

domain

Account.java

package com.itheima.domain;

import java.io.Serializable;

public class Account implements Serializable {

    private Integer id;
    private String name;
    private Double money;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Double getMoney() {
        return money;
    }

    public void setMoney(Double money) {
        this.money = money;
    }

    @Override
    public String toString() {
        return "Account{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", money=" + money +
                '}';
    }
}

service

AccountService.java

package com.itheima.service;

import com.itheima.domain.Account;

import java.util.List;

public interface AccountService {

    void save(Account account);

    void delete(Integer id);

    void update(Account account);

    List<Account> findAll();

    Account findById(Integer id);

}

AccountServiceImpl.java

package com.itheima.service.impl;


import com.itheima.dao.AccountDao;
import com.itheima.domain.Account;
import com.itheima.service.AccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
@Service("accountService")
public class AccountServiceImpl implements AccountService {

    @Autowired
    private AccountDao accountDao;

    public void save(Account account) {
        accountDao.save(account);
    }

    public void update(Account account){
        accountDao.update(account);
    }

    public void delete(Integer id) {
        accountDao.delete(id);
    }

    public Account findById(Integer id) {
        return accountDao.findById(id);
    }

    public List<Account> findAll() {
        return accountDao.findAll();
    }
}

APP.java

import com.itheima.config.SpringConfig;
import com.itheima.domain.Account;
import com.itheima.service.AccountService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class App {
    public static void main(String[] args) {
//        ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
//        AccountService accountService = (AccountService) ctx.getBean("accountService");
//        Account ac = accountService.findById(2);
//        System.out.println(ac);

        ApplicationContext ctx = new AnnotationConfigApplicationContext(SpringConfig.class);
        AccountService accountService = (AccountService) ctx.getBean("accountService");
        Account ac = accountService.findById(2);
        System.out.println(ac);
    }
}

Junit

package com.itheima.service;

import com.itheima.config.SpringConfig;
import com.itheima.domain.Account;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import java.util.List;

//设定spring专用的类加载器
@RunWith(SpringJUnit4ClassRunner.class)
//设定加载的spring上下文对应的配置
@ContextConfiguration(classes = SpringConfig.class)
public class UserServiceTest {

    @Autowired
    private AccountService accountService;

    @Test
    public void testFindById(){
        Account ac = accountService.findById(2);
//        System.out.println(ac);
        Assert.assertEquals("Tom",ac.getName());
    }

    @Test
    public void testFindAll(){
        List<Account> list = accountService.findAll();
        Assert.assertEquals(3,list.size());
    }

}

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